Sources told 9NEWS that Holmes made three attempts at harming himself but described them as "not aggressive."

The first time, Holmes stood on his bed and tried to hit his head by
falling backwards. During the second attempt, Holmes ran across his
cell to hit his head on the wall. During the third attempt, Homes hit
his head on the wall.

After the three incidents, Holmes was transported to the hospital with unknown injuries. He was back in his cell Wednesday.